Comets as parent bodies of CI1 carbonaceous meteorites and possible habitats of ice-microbes

N. Chandra Wickramasinghe; Janaki T. Wickramasinghe; Jamie Wallis; Richard B. Hoover; Alexei Yu. Rozanov

doi:10.1117/12.975979

13 November 2012 Comets as parent bodies of CI1 carbonaceous meteorites and possible habitats of ice-microbes

N. Chandra Wickramasinghe, Janaki T. Wickramasinghe, Jamie Wallis, Richard B. Hoover, Alexei Yu. Rozanov

Proceedings Volume 8521, Instruments, Methods, and Missions for Astrobiology XV; 85210Q (2012) https://doi.org/10.1117/12.975979
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

Abstract

Recent studies of comets and cometary dust have confirmed the presence of biologically relevant organic molecules along with clay minerals and water ice. It is also now well established by deuterium/hydrogen ratios that the CI1 carbonaceous meteorites contain indigenous extraterrestrial water. The evidence of extensive aqueous alteration of the minerals in these meteorites led to the hypothesis that water-bearing asteroids or comets represent the parent bodies of the CI1 (and perhaps CM2) carbonaceous meteorites. These meteorites have also been shown to possess a diverse array of complex organics and chiral and morphological biomarkers. Stable isotope studies by numerous independent investigators have conclusively established that the complex organics found in these meteorites are both indigenous and extraterrestrial in nature. Although the origin of these organics is still unknown, some researchers have suggested that they originated by unknown abiotic mechanisms and may have played a role in the delivery of chiral biomolecules and the origin of life on Early Earth.

Citation Download Citation

N. Chandra Wickramasinghe, Janaki T. Wickramasinghe, Jamie Wallis, Richard B. Hoover, and Alexei Yu. Rozanov "Comets as parent bodies of CI1 carbonaceous meteorites and possible habitats of ice-microbes", Proc. SPIE 8521, Instruments, Methods, and Missions for Astrobiology XV, 85210Q (13 November 2012); https://doi.org/10.1117/12.975979

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